CN-121991478-A - PC/PBT alloy material and preparation method and application thereof

Abstract

The invention relates to a PC/PBT alloy material, a preparation method and application thereof. The PC/PBT alloy material comprises PC resin, PBT resin, talcum powder, a brominated flame retardant and phosphoric acid sodium salt. The PC/PBT alloy material has good flame retardant property, oil resistance and laser welding strength.

Inventors

• LIU BO
• ZHANG YONG
• CHEN PINGXU
• YE NANBIAO
• Peng minle
• XU HAOYU
• YANG ZHIJUN
• LI XIANG
• Cen yin
• AI JUNWEI

Assignees

• 金发科技股份有限公司

Dates

Publication Date

20260508

Application Date

20241105

Claims (10)

1. 1. The PC/PBT alloy material is characterized by comprising the following components in parts by weight: the average particle size of the talcum powder is 2-12 mu m.
2. 2. The PC/PBT alloy material according to claim 1, characterized in that the PC resin has a melt index of 5-40 g/10min measured at 300 ℃ and 1.2 kg.
3. 3. The PC/PBT alloy material of claim 1, wherein the PBT resin has an intrinsic viscosity of 0.6 to 1.5dl/g.
4. 4. The PC/PBT alloy material of claim 1, wherein the brominated flame retardant is at least one of brominated epoxy, brominated triazine, brominated polycarbonate, decabromodiphenylethane, or brominated polystyrene.
5. 5. The PC/PBT alloy material of claim 1, wherein the sodium phosphate salt is at least one of sodium dihydrogen phosphate, sodium dihydrogen phosphate dihydrate, or sodium acid pyrophosphate.
6. 6. The PC/PBT alloy material according to claim 1, wherein the mass percentage of talcum powder in the PC/PBT alloy material is 4.5-20%.
7. 7. The PC/PBT alloy material according to claim 1, further comprising 0.5-2.5 parts of other auxiliary agents.
8. 8. The PC/PBT alloy material of claim 7, wherein the other auxiliary agent is at least one of an anti-drip agent, an antioxidant, a lubricant, or a colorant.
9. 9. The preparation method of the PC/PBT alloy material according to any one of claims 1 to 8 is characterized by comprising the steps of mixing the components, carrying out melt extrusion and granulating to obtain the PC/PBT alloy material.
10. 10. The use of the PC/PBT alloy material according to any of claims 1 to 8 for the preparation of automotive parts, electric tool parts or electronic and electrical parts.

Description

PC/PBT alloy material and preparation method and application thereof Technical Field The invention relates to the technical field of modification of high polymer materials, in particular to a PC/PBT alloy material, and a preparation method and application thereof. Background Polycarbonate (polycarbonate PC) is an amorphous thermoplastic with very high transparency, and is one of five engineering plastics. Polycarbonates have extremely important positions in the optical field due to their unique characteristics of high light transmittance, high impact resistance, easy processing and molding, and the like. The light transmittance of the polycarbonate can reach 89%, the haze is less than 0.3%, the refractive index is 1.58, and the obtained product has excellent optical performance, colorless and transparent appearance and excellent infrared transmission performance, and has wide application in application scenes requiring high rigidity and infrared high transmission, such as transparent windows, mechanical baffles and the like of automobile lamps, automobile glass, electronic and electric windows and the like. Polybutylene terephthalate (PBT) is a milky translucent to opaque, semi-crystalline thermoplastic polyester that is not resistant to strong acids, strong bases, organic solvents, flammability, and decomposition at high temperatures. The PBT resin is mostly processed into a compound for use, and can obtain good comprehensive properties such as organic solvent resistance, electric insulation and the like and good processability by modifying with various additives and blending with other resins. PC and PBT are mixed to prepare PC/PBT alloy, so that the advantages of the PC and the PBT can be combined, and the application of various scenes can be satisfied. In the application scenes of high-current or high-power electric parts, the requirements on the flame retardant property, the mechanical property and the high-temperature resistance of the PC/PBT alloy are high, and the flame retardant property, the mechanical property and the high-temperature resistance of the PC are better than those of the PBT, so that the PC consumption of the PC/PBT alloy in the application scenes is generally larger than that of the PBT. However, if the amount of PC is larger than the amount of PBT, the laser welding strength of the PC/PBT alloy is poor and the improvement is more difficult than in the case where the amount of PBT is larger than the amount of PC. Laser welding is an economical and efficient way of joining polymeric materials, and is particularly important when sensitive components are included in the components to be joined. And when the PC consumption is larger than the PBT consumption, the applicability of laser welding to PC/PBT alloy is obviously limited. In addition, if the PBT of the PC/PBT alloy is used in a small amount, the oil resistance of the PC/PBT alloy is at a common level, so that when the PC/PBT alloy is modified in terms of laser welding strength and the like, attention is paid to the fact that the oil resistance of the PC/PBT alloy is not obviously deteriorated so as to avoid limiting the application of the PC/PBT alloy to the scene of contacting engine oil. Disclosure of Invention The invention aims at solving the problems that the laser welding strength of the PC/PBT alloy material with more PC consumption is not high and oil resistance is required to be considered, and provides a PC/PBT alloy material. The invention further aims to provide a preparation method of the PC/PBT alloy material. The invention further aims to provide an application of the PC/PBT alloy material in preparing automobile parts, electric tool parts or electronic and electric parts. The above object of the present invention is achieved by the following technical solutions: the PC/PBT alloy material comprises the following components in parts by weight: the average particle size of the talcum powder is 2-12 mu m. The inventor of the present invention found that adding talc powder with a specific average particle size to a PC/PBT alloy material can make the material exhibit good laser welding strength. If the average particle size of talcum powder is not proper or the selected filler is not proper, the laser welding strength of the material cannot be effectively improved. In addition, talcum powder with specific granularity has two functions, namely, on one hand, talcum powder does not obviously deteriorate oil resistance of a material, so that the oil resistance of PC/PBT alloy material is maintained, and if the type of filler is not properly selected, such as calcium carbonate or wollastonite, the oil resistance is obviously deteriorated. On the other hand, the flaky structure of the talcum powder is beneficial to the formation of a carbon skeleton when the PC/PBT alloy material burns, so that the flame retardant property is improved. In order to meet the PC/PBT alloy material, a flame retardant is also required to be added